bed bugs; I'd not experienced them before, and ignored the mattress signs the first night as the host insisted that they had never had them, I'm now scrambling to clean my luggage in another Airbnb hoping for the best. the host would not accept it was bed bugs even after I found and photographed, the clearly previously infested mattress, 3 bed bugs, and bite marks. that and the elevators look like deathtraps in the building. also fyi Airbnb are no help and offer no assistance if it's bed bugs.